This is something that Lubuntu devs should check about.
By default xfce4-power-manager has a .desktop startup file inside /etc/xdg/autostart .
Lubuntu 13.10 and newer versions are not reading this folder for autostart applications, so a user should add the xcfe4-power-manager command in .config/lxsession/Lubuntu/autostart file if he/she wants the power-manager to start properly.
I think that Lubntu devs should think about and create this file and add it to .config/lxsession/Lubuntu/autostart by default.
This is something that Lubuntu devs should check about.
By default xfce4-power-manager has a .desktop startup file inside /etc/xdg/autostart .
Lubuntu 13.10 and newer versions are not reading this folder for autostart applications, so a user should add the xcfe4-power-manager command in .config/ lxsession/ Lubuntu/ autostart file if he/she wants the power-manager to start properly.
I think that Lubntu devs should think about and create this file and add it to .config/ lxsession/ Lubuntu/ autostart by default.
Regards
NikTh